package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**检查用户是否登陆
 * @author huhanzhao
 * @create 2022-11-03-17:58
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();


    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取本次uri
        String requestURI = request.getRequestURI();
        log.info("拦截到的请求：{}",requestURI);
        //1.定义不需要处理的请求
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };


        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //3.不需要处理
        if (check){
            filterChain.doFilter(request,response);
            log.info("本次请求{}不需要处理",requestURI);
            return;
        }
        //4.判断登陆状态，登陆就放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id是{}",request.getSession().getAttribute("employee"));
            log.info("线程id是{}",Thread.currentThread().getId());
            Long empId = (Long)request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录");
        //4.判断登陆状态，登陆就放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id是{}",request.getSession().getAttribute("user"));

            Long userId = (Long)request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }
        //5.没有登陆,通过输出流的方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

        }


    public boolean check (String[] urls,String requestURI){
        for (String url : urls){
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
